Also internal audio.
In the T02, T04 Menu items, found by scrolling all the way to the bottom of the "Set Up" menus, there are several test signals available, including black. In audio, the options are "off", silence, and 1KHz sine.
Broadcasters discourage the use of the internally generated bars and instead want those kind of references to come from the program generating source. Typically, I construct my "tapeout" sequences to include bars, tone, black, slate, etc., in the configuration that the broadcaster has specified.